More and more people are afraid of death. As a result, the fitness is expected to expand.
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The choice of career depends on the factors such as personal educations,skills, qualities and salary prospects.
A. 对
B. 错
轴套类零件一般在车床或磨床加工,其主视图按加工位置将轴线( )放置。
A. 水平
B. 垂直
C. 倾斜
D. 任意位置
盘盖类零件一般采用两个基本视图表达,主视图采用剖视表达孔、槽等结构,另一基本视图表达外形轮廓和各组成部分。
A. 对
B. 错
叉架类零件一般由支撑、安装和连接三部分组成,形状比较复杂,常为铸件。
A. 对
B. 错